package com.may._6;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

class ShareResource{
    private int number = 1;//A;1 B:2 C:3
    private Lock lock = new ReentrantLock();
    private Condition condition1 = lock.newCondition();
    private Condition condition2 = lock.newCondition();
    private Condition condition3 = lock.newCondition();

    public void print5(){
        lock.lock();
        try {
            while (number != 1){
                condition1.await();
            }
            for (int i = 0; i < 5; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            number = 2;
            condition2.signal();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }

    public void print10(){
        lock.lock();
        try {
            while (number != 2){
                condition2.await();
            }
            for (int i = 0; i < 10; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            number = 3;
            condition3.signal();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }

    public void print15(){
        lock.lock();
        try {
            while (number != 3){
                condition3.await();
            }
            for (int i = 0; i < 15; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            number = 1;
            condition1.signal();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
}
/**
 * 多线程间按顺序调用，实现 A -> b -> C 三个线程启动，要求如下：
 * A打印5次，b打印10次，C打印15次
 * 接着 A打印5次，B打印10次，C打印15次
 */
public class SyncAndReentrantLockDemo {
    public static void main(String[] args) {
        ShareResource shareResource = new ShareResource();
        new Thread(() -> {
            for (int i = 0; i < 2; i++) {
                shareResource.print5();
            }
        },"A").start();
        new Thread(() -> {
            for (int i = 0; i < 2; i++) {
                shareResource.print10();
            }
        },"B").start();
        new Thread(() -> {
            for (int i = 0; i < 2; i++) {
                shareResource.print15();
            }
        },"C").start();
    }
}
